# Windows 11 21H2 vulnerabilities > Windows 11 21H2 is made by Microsoft. We track 1,031 published vulnerabilities in it, across 73 versions. 66 of them are on the list of flaws known to be exploited, the newest added on 13 April 2026. If you run Windows 11 21H2, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/microsoft/windows_11_21h2 ## At a glance - **Made by:** [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) - **Published vulnerabilities:** 1,031 - **Known to be exploited:** 66 - **Versions tracked:** 73 - **Most recently added to the known-exploited list:** [CVE-2023-36424](https://www.precursorintelligence.com/what-is/cve-2023-36424), 13 April 2026. We keep watching the list. ## Which versions of Windows 11 21H2 do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "before 10.0.22000.2600" means every version up to, but not including, 10.0.22000.2600. - [CVE-2023-36424](https://www.precursorintelligence.com/what-is/cve-2023-36424) (Microsoft Windows Out-of-Bounds Read Vulnerability): before 10.0.22000.2600 - [CVE-2024-35250](https://www.precursorintelligence.com/what-is/cve-2024-35250) (Microsoft Windows Kernel-Mode Driver Untrusted Pointer Dereference Vulnerability): before 10.0.22000.3019 - [CVE-2024-30088](https://www.precursorintelligence.com/what-is/cve-2024-30088) (Microsoft Windows Kernel TOCTOU Race Condition Vulnerability): before 10.0.22000.3019 - [CVE-2024-43573](https://www.precursorintelligence.com/what-is/cve-2024-43573) (Microsoft Windows MSHTML Platform Spoofing Vulnerability): before 10.0.22000.3260 - [CVE-2024-43572](https://www.precursorintelligence.com/what-is/cve-2024-43572) (Microsoft Windows Management Console Remote Code Execution Vulnerability): before 10.0.22000.3260 - [CVE-2024-43461](https://www.precursorintelligence.com/what-is/cve-2024-43461) (Microsoft Windows MSHTML Platform Spoofing Vulnerability): before 10.0.22000.3197 - [CVE-2024-38217](https://www.precursorintelligence.com/what-is/cve-2024-38217) (Microsoft Windows Mark of the Web (MOTW) Protection Mechanism Failure Vulnerability): before 10.0.22000.3197 - [CVE-2024-38014](https://www.precursorintelligence.com/what-is/cve-2024-38014) (Microsoft Windows Installer Improper Privilege Management Vulnerability): before 10.0.22000.3197 - [CVE-2024-38107](https://www.precursorintelligence.com/what-is/cve-2024-38107) (Microsoft Windows Power Dependency Coordinator Privilege Escalation Vulnerability): before 10.0.22000.3147 - [CVE-2024-38106](https://www.precursorintelligence.com/what-is/cve-2024-38106) (Microsoft Windows Kernel Privilege Escalation Vulnerability): before 10.0.22000.3147 - [CVE-2024-38193](https://www.precursorintelligence.com/what-is/cve-2024-38193) (Microsoft Windows Ancillary Function Driver for WinSock Privilege Escalation Vulnerability): before 10.0.22000.3147 - [CVE-2024-38213](https://www.precursorintelligence.com/what-is/cve-2024-38213) (Microsoft Windows SmartScreen Security Feature Bypass Vulnerability): before 10.0.22000.3019 - [CVE-2024-38178](https://www.precursorintelligence.com/what-is/cve-2024-38178) (Microsoft Windows Scripting Engine Memory Corruption Vulnerability): before 10.0.22000.3147 - [CVE-2024-38080](https://www.precursorintelligence.com/what-is/cve-2024-38080) (Microsoft Windows Hyper-V Privilege Escalation Vulnerability): before 10.0.22000.3079 - [CVE-2024-38112](https://www.precursorintelligence.com/what-is/cve-2024-38112) (Microsoft Windows MSHTML Platform Spoofing Vulnerability): before 10.0.22000.3079 - [CVE-2024-26169](https://www.precursorintelligence.com/what-is/cve-2024-26169) (Microsoft Windows Error Reporting Service Improper Privilege Management Vulnerability): before 10.0.22000.2836 - [CVE-2024-30040](https://www.precursorintelligence.com/what-is/cve-2024-30040) (Microsoft Windows MSHTML Platform Security Feature Bypass Vulnerability): before 10.0.22000.2960 - [CVE-2024-30051](https://www.precursorintelligence.com/what-is/cve-2024-30051) (Microsoft DWM Core Library Privilege Escalation Vulnerability): before 10.0.22000.2960 - [CVE-2024-21338](https://www.precursorintelligence.com/what-is/cve-2024-21338) (Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability): before 10.0.22000.2777 - [CVE-2023-29360](https://www.precursorintelligence.com/what-is/cve-2023-29360) (Microsoft Streaming Service Untrusted Pointer Dereference Vulnerability): before 10.0.22000.2057 - [CVE-2024-21412](https://www.precursorintelligence.com/what-is/cve-2024-21412) (Microsoft Windows Internet Shortcut Files Security Feature Bypass Vulnerability): before 10.0.22000.2777 - [CVE-2024-21351](https://www.precursorintelligence.com/what-is/cve-2024-21351) (Microsoft Windows SmartScreen Security Feature Bypass Vulnerability): before 10.0.22000.2777 - [CVE-2023-36584](https://www.precursorintelligence.com/what-is/cve-2023-36584) (Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability): before 10.0.22000.2538 - [CVE-2023-36033](https://www.precursorintelligence.com/what-is/cve-2023-36033) (Microsoft Windows Desktop Window Manager (DWM) Core Library Privilege Escalation Vulnerability): before 10.0.22000.2600 - [CVE-2023-36036](https://www.precursorintelligence.com/what-is/cve-2023-36036) (Microsoft Windows Cloud Files Mini Filter Driver Privilege Escalation Vulnerability): before 10.0.22000.2600 - [CVE-2023-36563](https://www.precursorintelligence.com/what-is/cve-2023-36563) (Microsoft WordPad Information Disclosure Vulnerability): before 10.0.22000.2538 - [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487) (HTTP/2 Rapid Reset Attack Vulnerability): before 10.0.22000.2538 - [CVE-2023-28229](https://www.precursorintelligence.com/what-is/cve-2023-28229) (Microsoft Windows CNG Key Isolation Service Privilege Escalation Vulnerability): before 10.0.22000.1817 2 more exploited flaws name Windows 11 21H2 without a version of its own (for example as the system other affected software runs on). They are in the list below. Checked: the 30 most recently added of 50 exploited flaws. ## Which Windows 11 21H2 vulnerabilities are being exploited? 50 flaws are on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2023-36424](https://www.precursorintelligence.com/what-is/cve-2023-36424): Microsoft Windows Out-of-Bounds Read Vulnerability. High, CVSS 7.8, chance of use in 30 days 12%, known exploited since 13 April 2026. - [CVE-2024-29059](https://www.precursorintelligence.com/what-is/cve-2024-29059): Microsoft .NET Framework Information Disclosure Vulnerability. High, CVSS 7.5, chance of use in 30 days 99%, known exploited since 4 February 2025. - [CVE-2024-35250](https://www.precursorintelligence.com/what-is/cve-2024-35250): Microsoft Windows Kernel-Mode Driver Untrusted Pointer Dereference Vulnerability. High, CVSS 7.8, chance of use in 30 days 25%, known exploited since 16 December 2024. - [CVE-2024-30088](https://www.precursorintelligence.com/what-is/cve-2024-30088): Microsoft Windows Kernel TOCTOU Race Condition Vulnerability. High, CVSS 7.0, chance of use in 30 days 68%, known exploited since 15 October 2024. - [CVE-2024-43573](https://www.precursorintelligence.com/what-is/cve-2024-43573): Microsoft Windows MSHTML Platform Spoofing Vulnerability. High, CVSS 8.1, chance of use in 30 days 46%, known exploited since 8 October 2024. - [CVE-2024-43572](https://www.precursorintelligence.com/what-is/cve-2024-43572): Microsoft Windows Management Console Remote Code Execution Vulnerability. High, CVSS 7.8, chance of use in 30 days 67%, known exploited since 8 October 2024. - [CVE-2024-43461](https://www.precursorintelligence.com/what-is/cve-2024-43461): Microsoft Windows MSHTML Platform Spoofing Vulnerability. High, CVSS 8.8, chance of use in 30 days 54%, known exploited since 16 September 2024. - [CVE-2024-38217](https://www.precursorintelligence.com/what-is/cve-2024-38217): Microsoft Windows Mark of the Web (MOTW) Protection Mechanism Failure Vulnerability. Medium, CVSS 5.4, chance of use in 30 days 10%, known exploited since 10 September 2024. - [CVE-2024-38014](https://www.precursorintelligence.com/what-is/cve-2024-38014): Microsoft Windows Installer Improper Privilege Management Vulnerability. High, CVSS 7.8, chance of use in 30 days 6.3%, known exploited since 10 September 2024. - [CVE-2024-38107](https://www.precursorintelligence.com/what-is/cve-2024-38107): Microsoft Windows Power Dependency Coordinator Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.6%, known exploited since 13 August 2024. - [CVE-2024-38106](https://www.precursorintelligence.com/what-is/cve-2024-38106): Microsoft Windows Kernel Privilege Escalation Vulnerability. High, CVSS 7.0, chance of use in 30 days 6.3%, known exploited since 13 August 2024. - [CVE-2024-38193](https://www.precursorintelligence.com/what-is/cve-2024-38193): Microsoft Windows Ancillary Function Driver for WinSock Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 29%, known exploited since 13 August 2024. - [CVE-2024-38213](https://www.precursorintelligence.com/what-is/cve-2024-38213): Microsoft Windows SmartScreen Security Feature Bypass Vulnerability. Medium, CVSS 6.5, chance of use in 30 days 14%, known exploited since 13 August 2024. - [CVE-2024-38178](https://www.precursorintelligence.com/what-is/cve-2024-38178): Microsoft Windows Scripting Engine Memory Corruption Vulnerability. High, CVSS 7.5, chance of use in 30 days 41%, known exploited since 13 August 2024. - [CVE-2024-38080](https://www.precursorintelligence.com/what-is/cve-2024-38080): Microsoft Windows Hyper-V Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 7.1%, known exploited since 9 July 2024. - [CVE-2024-38112](https://www.precursorintelligence.com/what-is/cve-2024-38112): Microsoft Windows MSHTML Platform Spoofing Vulnerability. High, CVSS 7.5, chance of use in 30 days 84%, known exploited since 9 July 2024. - [CVE-2024-26169](https://www.precursorintelligence.com/what-is/cve-2024-26169): Microsoft Windows Error Reporting Service Improper Privilege Management Vulnerability. High, CVSS 7.8, chance of use in 30 days 4.0%, known exploited since 13 June 2024. - [CVE-2024-30040](https://www.precursorintelligence.com/what-is/cve-2024-30040): Microsoft Windows MSHTML Platform Security Feature Bypass Vulnerability. High, CVSS 8.8, chance of use in 30 days 3.9%, known exploited since 14 May 2024. - [CVE-2024-30051](https://www.precursorintelligence.com/what-is/cve-2024-30051): Microsoft DWM Core Library Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 5.7%, known exploited since 14 May 2024. - [CVE-2024-21338](https://www.precursorintelligence.com/what-is/cve-2024-21338): Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability. High, CVSS 7.8, chance of use in 30 days 60%, known exploited since 4 March 2024. - [CVE-2023-29360](https://www.precursorintelligence.com/what-is/cve-2023-29360): Microsoft Streaming Service Untrusted Pointer Dereference Vulnerability. High, CVSS 8.4, chance of use in 30 days 22%, known exploited since 29 February 2024. - [CVE-2024-21412](https://www.precursorintelligence.com/what-is/cve-2024-21412): Microsoft Windows Internet Shortcut Files Security Feature Bypass Vulnerability. High, CVSS 8.1, chance of use in 30 days >99%, known exploited since 13 February 2024. - [CVE-2024-21351](https://www.precursorintelligence.com/what-is/cve-2024-21351): Microsoft Windows SmartScreen Security Feature Bypass Vulnerability. High, CVSS 7.6, chance of use in 30 days 28%, known exploited since 13 February 2024. - [CVE-2023-36584](https://www.precursorintelligence.com/what-is/cve-2023-36584): Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability. Medium, CVSS 5.4, chance of use in 30 days 3.3%, known exploited since 16 November 2023. - [CVE-2023-36033](https://www.precursorintelligence.com/what-is/cve-2023-36033): Microsoft Windows Desktop Window Manager (DWM) Core Library Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 11%, known exploited since 14 November 2023. - [CVE-2023-36036](https://www.precursorintelligence.com/what-is/cve-2023-36036): Microsoft Windows Cloud Files Mini Filter Driver Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 17%, known exploited since 14 November 2023. - [CVE-2023-36025](https://www.precursorintelligence.com/what-is/cve-2023-36025): Microsoft Windows SmartScreen Security Feature Bypass Vulnerability. High, CVSS 8.8, chance of use in 30 days 88%, known exploited since 14 November 2023. - [CVE-2023-36563](https://www.precursorintelligence.com/what-is/cve-2023-36563): Microsoft WordPad Information Disclosure Vulnerability. Medium, CVSS 6.5, chance of use in 30 days 20%, known exploited since 10 October 2023. - [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487): HTTP/2 Rapid Reset Attack Vulnerability. High, CVSS 7.5, chance of use in 30 days >99%, known exploited since 10 October 2023. - [CVE-2023-28229](https://www.precursorintelligence.com/what-is/cve-2023-28229): Microsoft Windows CNG Key Isolation Service Privilege Escalation Vulnerability. High, CVSS 7.0, chance of use in 30 days 1.7%, known exploited since 4 October 2023. - [CVE-2023-36802](https://www.precursorintelligence.com/what-is/cve-2023-36802): Microsoft Streaming Service Proxy Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 28%, known exploited since 12 September 2023. - [CVE-2023-36884](https://www.precursorintelligence.com/what-is/cve-2023-36884): Microsoft Windows Search Remote Code Execution Vulnerability. High, CVSS 7.5, chance of use in 30 days 99%, known exploited since 17 July 2023. - [CVE-2023-36874](https://www.precursorintelligence.com/what-is/cve-2023-36874): Microsoft Windows Error Reporting Service Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 43%, known exploited since 11 July 2023. - [CVE-2023-32046](https://www.precursorintelligence.com/what-is/cve-2023-32046): Microsoft Windows MSHTML Platform Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 10%, known exploited since 11 July 2023. - [CVE-2023-32049](https://www.precursorintelligence.com/what-is/cve-2023-32049): Microsoft Windows Defender SmartScreen Security Feature Bypass Vulnerability. High, CVSS 8.8, chance of use in 30 days 4.2%, known exploited since 11 July 2023. - [CVE-2023-28252](https://www.precursorintelligence.com/what-is/cve-2023-28252): Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 49%, known exploited since 11 April 2023. - [CVE-2023-24880](https://www.precursorintelligence.com/what-is/cve-2023-24880): Microsoft Windows SmartScreen Security Feature Bypass Vulnerability. Medium, CVSS 4.4, chance of use in 30 days 78%, known exploited since 14 March 2023. - [CVE-2023-23376](https://www.precursorintelligence.com/what-is/cve-2023-23376): Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 11%, known exploited since 14 February 2023. - [CVE-2023-21823](https://www.precursorintelligence.com/what-is/cve-2023-21823): Microsoft Windows Graphic Component Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 5.6%, known exploited since 14 February 2023. - [CVE-2023-21674](https://www.precursorintelligence.com/what-is/cve-2023-21674): Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability. High, CVSS 8.8, chance of use in 30 days 41%, known exploited since 10 January 2023. - [CVE-2022-44698](https://www.precursorintelligence.com/what-is/cve-2022-44698): Microsoft Defender SmartScreen Security Feature Bypass Vulnerability. Medium, CVSS 5.4, chance of use in 30 days 76%, known exploited since 13 December 2022. - [CVE-2022-41049](https://www.precursorintelligence.com/what-is/cve-2022-41049): Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability. Medium, CVSS 5.4, chance of use in 30 days 2.6%, known exploited since 14 November 2022. - [CVE-2022-41128](https://www.precursorintelligence.com/what-is/cve-2022-41128): Microsoft Windows Scripting Languages Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 25%, known exploited since 8 November 2022. - [CVE-2022-41073](https://www.precursorintelligence.com/what-is/cve-2022-41073): Microsoft Windows Print Spooler Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 2.4%, known exploited since 8 November 2022. - [CVE-2022-41091](https://www.precursorintelligence.com/what-is/cve-2022-41091): Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability. Medium, CVSS 5.4, chance of use in 30 days 1.9%, known exploited since 8 November 2022. - [CVE-2022-41125](https://www.precursorintelligence.com/what-is/cve-2022-41125): Microsoft Windows CNG Key Isolation Service Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 3.0%, known exploited since 8 November 2022. - [CVE-2022-41033](https://www.precursorintelligence.com/what-is/cve-2022-41033): Microsoft Windows COM+ Event System Service Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.9%, known exploited since 11 October 2022. - [CVE-2022-37969](https://www.precursorintelligence.com/what-is/cve-2022-37969): Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 28%, known exploited since 14 September 2022. - [CVE-2022-26923](https://www.precursorintelligence.com/what-is/cve-2022-26923): Microsoft Active Directory Domain Services Privilege Escalation Vulnerability. High, CVSS 8.8, chance of use in 30 days 84%, known exploited since 18 August 2022. - [CVE-2022-21971](https://www.precursorintelligence.com/what-is/cve-2022-21971): Microsoft Windows Runtime Remote Code Execution Vulnerability. High, CVSS 7.8, chance of use in 30 days 54%, known exploited since 18 August 2022. ## Which Windows 11 21H2 flaws are most likely to be used? Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days): - [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487): >99%, High (CVSS 7.5), known exploited - [CVE-2021-34527](https://www.precursorintelligence.com/what-is/cve-2021-34527): >99%, High (CVSS 8.8), known exploited - [CVE-2024-21412](https://www.precursorintelligence.com/what-is/cve-2024-21412): >99%, High (CVSS 8.1), known exploited - [CVE-2022-30190](https://www.precursorintelligence.com/what-is/cve-2022-30190): >99%, High (CVSS 7.8), known exploited - [CVE-2023-36884](https://www.precursorintelligence.com/what-is/cve-2023-36884): 99%, High (CVSS 7.5), known exploited - [CVE-2024-29059](https://www.precursorintelligence.com/what-is/cve-2024-29059): 99%, High (CVSS 7.5), known exploited - [CVE-2023-21554](https://www.precursorintelligence.com/what-is/cve-2023-21554): 95%, Critical (CVSS 9.8) - [CVE-2023-35628](https://www.precursorintelligence.com/what-is/cve-2023-35628): 93%, High (CVSS 8.1) - [CVE-2023-28302](https://www.precursorintelligence.com/what-is/cve-2023-28302): 93%, High (CVSS 7.5) - [CVE-2023-21547](https://www.precursorintelligence.com/what-is/cve-2023-21547): 89%, High (CVSS 7.5) ## Questions ### How many vulnerabilities does Windows 11 21H2 have? We track 1,031 published vulnerabilities listed under the name Windows 11 21H2, across 73 versions. The most recent Windows 11 21H2 flaw added to the known-exploited list is CVE-2023-36424, on 13 April 2026. ### Which Windows 11 21H2 vulnerabilities are being exploited? 66 are on the list of flaws known to be exploited. The most recently added are CVE-2023-36424, CVE-2024-29059 and CVE-2024-35250. ### Which versions of Windows 11 21H2 do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2023-36424, affects before 10.0.22000.2600. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Windows 11 21H2? Create a Precursor Intelligence account and track Windows 11 21H2. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook. ## Running Windows 11 21H2? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact